Island



(No Model.)

N.T. GRBBNE.

STEAM ENGINE.

Patented Oct.

un l E1 NIS UNITED-A STATES PATENT SENCE..

NOBLE T. GREENE, OE PROVIDENCE, RHODE IsLAND. t

STEAM-ENGINE.

sPEcIErgrgoN forming part of Letters atent No. 548,753, dated october 29, 1895. Application filed August 3, 1895. Serial No. 558,102.' (No model.)

To @ZZ wle/m it mwyconcern:

Be it known that I, NOBLE T. GREENE, a citizen of the United States, residing at Providence, inthe county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Steam-Engines; and I doV hereby declaijethe following to bea full, clear, an'dexact'ldescription of the invention, such as will enable'others skilled in theart to which it appertains to make and use the same, reference being had to the aocomp'anying drawings, and to letters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in steam-engines of the 'class having automatically-controlled liberating valve-gear for the steam-inlet valves; and it consists, essentially, in the combination, in a steam-engine, with the steam-cylinder having self-closing steamvalves, means for openingsaid valves, and lib,` erating valve-gear through which the steamvalves are capable of being tripped'or released automatically at dilferent points in the stroke of the engine by the action of the governor, of self-closing exhaust-valves, mechanism for opening said exhaust-valves, detachable valve-gear through which the exl `haust-valves are tripped or released, ,and

ves

means connected with and actuated bythe governor for effecting such release of the exhaust-valves automatically, all as will be more fully hereinafter set forth and claimed.

In steam-engines of the automatic cut-olf type provided with cylinders in which steam is used expansively and having independent steam and exhaust valves it has been usual hitherto, so far as I am aware, to employ posi tive-action exhaust-valves--that is, exhaust-valves so set or adjusted that the point of'steam-releasefrom the cylinder is practically invariable and having no fixed relation to the point. at which the live steam entering the cylinder is cut off.

I have discoveredvthat the exhaust-valves of an engine shoul'dwork substantially iin unison with the inlet orA steam valves both in opening and closing, I n engine-valves as usually constructed andarranged lan" amount of steam and heat is taken from the engine which is not utilized. Consequently there is a loss in economy and regulation.

The principal object I have in view is to 4s'ave or utilize to a greater extent the steam entering the cylinder of theengine and at the .Sametime eiect a'better regulation of the lengine. To that end I apply a liberating `'valve-gear tothe exhaust-valves. be worked-by a slide-bar provided with tap- This can pets, the latter being controlled by the governor, dac., in such manner that the exhaustlvalves are opened and closed automatically in unison with the steam-valves.

. y In theaccompanying sheet of drawings,

Figure l is a partial side elevationof a steamengine embodying my improvements, and

Fig. 2 is an end view of the same.

ygear may be employed. As'drawn, the rotative'rods 1J ofthe two steam-valves carry on their rear lends, as seen in Fig. 1, suitablymounted toesf. These in turn are adapted to engage the upper ends of corresponding tap'petsl7 t, vertically movable in the supported horizontal slide-bar a. A positive reciprocating movement is imparted to the slidebarby means of the connection p, jointed to a rock arm or lever b, fulcrumed in the frame C, the rock-arm itself being oscillated by a rod n, adapted to be actuated by an eccentric mounted on the engine-shaft, as usual.

The free end of the eccentric-rod n is hooked onto a pin b2,secured to lever bk In order thatthe valve-gear may be worked by handsay as in starting and stopping the engine-the lever b is provided with a handle n', all constructed substantially as common.

The fly ball-governor B isactuated by a beltV TOO oted to the frame C, the same having an arm member c extending therefrom, to which vis jointed a light vertical rod t2, the upper end of the latter being jointed to a slidable collar c4 of the governor. Thus it Will be seen that the iiuctuations of the governor will move the collar up vor down, thereby causing the lever c to oscillate in unison with it through the medium of said rod i2 and arm c.

Below the slide-bar a, carrying the said tappets t, is located a gage-bar7 d, the same being provided with inclined or cam-shaped dogs d', supported on suitably-mounted rolls h. The lower ends of the tappets rest upon the gage-bar, the latter being connected to the governor-lever c by a link t'. Thus it will be seen that the action of the governor upon the gage-bar will cause the hook ends of the tappets to be brought nearer to or farther from the ends of the toes f, .thereby producing a correspondingly longer or shorter period of contact with the toes and vibrating thevalverods o' a corresponding extent, and thus at the same time open or uncover the steamports a corresponding amount; or, in other words, the positive travel of the slide-bar a, back and forth carries the tappets past the toesf, the latter during such movement swinging upward until the tappets slide from them, thereby at the same instant detaehing or liberating the corresponding steam-valve, which valve is immediately closed by a weight or vacuum-pot connected with an arm on the front end of the valve-rod, as usual.

lo, Fig. 2, indicates a rod or connection for such purpose. I would add that the Shanks of the toes, or, if desired, the tappets themselves, are usually provided with springs, so that the parts will yield sufficiently to permit the ends of the tappets to pass freely beneath he toes upon the return stroke ot' the slide- In my improved steam-engine Iprovide the exhaust-valves with detachable valve-gear. In the drawings the two valve rods or stems u2 of the exhaustvalves are provided with toes f arranged to engage or contact with tappets t', mounted in a suitably-supported slidebar a. Reciprocating motion is" imparted tothe bar a by a connection p', jointed thereto and to the lower end of the said rock-lever b. The vertical movements of the tappets are influenced by a gage-bar r, supported on rolls h, actuated by the said governor-controlled lever c and the lower connecting link or rod i.

As it is found to be desirable at times to change or adj ust the time and amount of opening of the exhaust-valves with respect to the steam-valves, so as to get more or less ileadf I provide the under side of the gage-bar at each end with a swinging adjustable dog or cam u. These dogs are adapted to bear upon the rolls h and are held in position after adjustment by screws or bolts s, located in the curved slotted lugs u', extending from the form, construction, and` arrangement of the valve-gear and connections represented in the accompanying drawings, as other kinds of detachable valve-gear may be employed for the steam and exhaust valves of a steam-engine- Withoiit departing frein the Spirit of ,the invention.

I claim as new and desire to secure by United States Letters Patentl. In a steam engine of the automatic cutoff type, having a steam cylinder provided with multiple self-Closing steam and exhaust valves through which steam is admitted into and released from the cylinder, a liberating valve-gear for opening the steam valves, a liberating valve-gear for opening the exhaust valves capable of workin g in unison with said steam valve-gear, and a single governor or regulating device and suitable connections arranged and adapted t0 coact with both said liberating valve mechanisms in tripping or releaping all 0f the valves at different peints in the engiries Stroke.

2. In an automatic cut-0E steam engine having a steam cylinder provided with two selfclosing steam yvalves and two self-closing exhaust valves, the combination therewith of liberating valve-gear mechanism for opening all of said valves, and governor-controlled means capable of enacting with said valveopening mechanism for automatically tripping all the several valves at variable points in the stroke of the engine.

3. In an automatic cut-oft steam engine, the combination with the steam cylinder, self- ClOSins independent steam and exhaust valves mounted therein, and positively driven detachable valve-gear for all of said valves, of governor-controlled mechanism capable of coacting with said valve-gear for automatically limiting or determining the point, or points, at Whihall the said Steam and exhaust valves shall close, and having the said governor-controlled mechanism further provided with means whereby the points at which the exhaust Valves close may4 be adjusted with re- SpeGt i0 the Steam valves, Substantially as described.

4:. In a cut-off steam engine provided with Self-.Closing steam and exhaust valves, oseillating valve-rods having toes mounted thereon through which the Seid valves, are actuated,

. two reciprocating Slide-bars. carrying tappets IOO IIO

adapted co-contact with said toes for opening stantially as hereinbefore described and for all of the said steam and exhaust valves, a the purpose set forth. ro pair of movable governor-controlled gage-bars In testimony whereof I have afxed my Sigprovded with dogs or earns capable of ohangnature in presence of two Witnesses. ing the vertical position of the tappets with respect to the toes, and having the dogs or cams of the lower or exhaust valve gage-bar further arranged to be set or adjusted, sub- Y NOBLE T. GREENE.

Witnesses:

GEO. H. REMINGTON,

REMINGTON SHERMAN. 

